Multi-impeller single-stage centrifugal pump.



1. H. SEBALD. MULTL-IMPELLER SiNGLESTAGE CENTRIFUGAL PUMP. 7 APPLICATIONFILED Nov. 14. 1913. 1,158,569.. Patented Nov. 2, 1915 v 2 SIHEETSSHEET1.

. J. H. SEBALD. .MULTI-IMPELLEB SINGLE STAGE CENTRIFUGAL/PUMP.

- APPLICATION FILED NOV- 4. 1913- 1,158,569. h Patented Nov. 2,1915.

A 2 .SHEETS-SHEET 2.

' I 114 x 15 v J a 18 /Z 17 15 l fi 2? W J ED STATES FATE ension;-

JOSEPH SEBALD, OF EASTON, PENNSYLVANIA, ASSIGNOR TO A. S. CAMERON STEAMPUMP WORKS, 013 NEW YORK, N..Y.,

A CORPORATION OF NEW JERSEY. I

MULTI-I iI PELLEn SINGLE-STAGE CENTRIFUGAL PUMP.

To all whom it may concern Be it known that I, 'Josnrii subject of theEmperor of Austria-Hunganv, having taken out my first naturalizationpapers in the United States, residing at Easton, in the county ofNorthampton and State of Pennsylvania, have invented a certain new anduseful Improvement in Multi- Impeller Single-Stage Centrifugal Pumps, ofwhich the following is a specification.

This invention relates to centrifugal pumps and more particularly to amultiimpeller single stage pump for use in pumping the water from thehot well of a condenser.

In the pumps which are at present generally used for removing the waterfrom the hot well 6f-.a condenser and which are generally of the singlestage type with a double suction central impeller, the stufling boxes inthe bearings are always exposed on their inner faces to the water\VlllfilLlS passing to the inlet of the pump and which. of course,

is at the same pressure as the interior of the condense chamber which,in high vacuum condensers, isaround 29 of vacuum. It has been foundvthat in such cases it is very difficult to construct the stuffing boxesso that air does not come through into the suction chamber of the pump.hen the water pumped is returned to the condenser, this air will lowerthe vacuum to an appreciable extent.

The object of the present invention is to construct a pump which has thenecessary stuffing boxes at each side-and is soconstructed that theinner ends of both these stufiing boxes are exposed, not to the pressureof the suction of the pump but to the pressure of the pump discharge,which is at least that of the atmosphere and will not allow any air tobe forced into the pump through the stufiing boxes. With this objeot inview, I have devised a pump a practical embodiment of which is shown inthe accompanying drawings in which:

Figure 1 is a side elevation which shows the suction and discharge pipesand Fig. 2 isa section through Fig. 1 on the line II,II.

ZThe pump, as shown, comprises a cylindrical casing 1 which is divide bypartitions 2 intothe central inlet 'hamber 3 into Specification ofLetters Patent.

H. SEBALD B.

Patented Nov. 1911 5 Application filed Nbveinberl i, 1913. Serial No.800,929.

chambers 5 which discharge lll'lI'OllghnlHdlvidual discharge pipes 6.Keyed L pon'a shaft .7 are impellers 8 which rotate inimpeller chambersand consist of disks 9,

0 blades 10 and covers 11. The disks 9 are imperforate and the covers 11bend around into sleeves 12 which engagethe inner edges of partitions 2.Each ,of the impellers therefore has but a single suction opening Iwhich opens from the central inlet chamber 3. The shaft 7 is j'ournaledin bearing boxes 13 which fit into cylindrical apertures in the sides ofthe casing 1. In the outer portions. of the bearing boxes 13, which alsoserve as stufiing boxes, are stuffing glands which are provided withwater seals 14 to which water is conveyed by passages 15 in the ca ing.The disks 9 are spaced a short distance vay from the sides of the casing1 so th-t a passage is provided which allows the water under pressurefrom the discharge of the impellers to pass down and come in contactwith the inner facesof: the. bearing boxes 13. In the inner portion ofthe boxes 13 are glands 16 which surround the shaft and are connected bypassages 17 to the casing so that water under pressure in the casing canenter the glands. bushings 19 allow the water to contact with thesurface of the shaft itself.

It will be evident that with the above described construction the innerfaces of the boxes13 will be at all times subjected to contact withwater at the pressure of the pump discharge, this water being conveyedalso to the glands 16 and thewater seal 14-. As the discharge pressureof the water is above that of the atmosphere it will be practicallyimpossible for any air to come along the shaft or otherwise into thepump casing. Although the pump here is shown with stuffing boxes whichserve also as bearing boxes, it is'evident that outside bearings couldbe provided and boxes 13 serve only as stufling boxes; I A

It isto be understood that the. present showing and descriptiondisclose-s only one specified modification of my invention and in thespirit and scope of the invention as expressed in the claims.

What I claim is: 1. In a multi-impeller ber, and impellerthambers oneach .sideof Perforations 18 in the centrifugal. pump; -a casingcomprising a central inlet chamgj tit?- other forms. and modificationsare included; If 4 said central chamber, coYerd impellei in saidimpcllcr chambers hav inginlets commum :ating only with said centralchamber,

a colomon'shaft for said impellers, boxes in th a outer faces of said,impeller chambers,

"stufli glands in said boxes, water glands slim unding said shaft insideof said stufling glands and means for conveying fluid under pressurefrom the discharge of said imp? llers to the impeller chamberscontiguous 10 said boxes.

2. In amulti-impeller centrifugal pump a caring comprising a centralinlet chamber I and impeller chambers on each side of said.

cent 'al chamber, covered impellers in said impeller chambers havingtheir only inlets a as, 569

my liangl.

JOSEPH H. SEBALD. VVltnesses:

' FRED S. OVERTON,

ALICE C. BRORSTROM.

